CVE-2024-42969 in FH1206
Summary
by MITRE • 08/15/2024
Tenda FH1206 v02.03.01.35 was discovered to contain a stack overflow via the page parameter in the fromSafeUrlFilter function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted POST request.
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Analysis
by VulDB Data Team • 08/17/2024
The vulnerability identified as CVE-2024-42969 affects the Tenda FH1206 router firmware version v02.03.01.35, representing a critical stack overflow condition within the web interface handling mechanism. This flaw exists within the fromSafeUrlFilter function, which processes incoming HTTP requests to filter and validate URLs before they are processed by the device's web server component. The stack overflow occurs when the page parameter in a POST request exceeds the allocated buffer space, causing the program to overwrite adjacent memory locations on the stack. This memory corruption directly impacts the router's ability to maintain stable operation and can lead to complete system termination.
The technical exploitation of this vulnerability requires an attacker to craft a malicious POST request containing an excessively long page parameter value that surpasses the predetermined buffer limits within the fromSafeUrlFilter function. This specific implementation flaw falls under the CWE-121 stack buffer overflow category, where the program uses a fixed-length buffer that cannot accommodate variable-length input data without proper bounds checking. The vulnerability's impact extends beyond simple denial of service as it represents a potential entry point for more sophisticated attacks that could leverage the memory corruption to execute arbitrary code or escalate privileges within the router's operating environment.
From an operational perspective, this vulnerability presents a significant risk to network infrastructure security as it allows remote attackers to induce a denial of service condition without requiring authentication or specialized access privileges. The affected Tenda FH1206 device becomes completely unresponsive to legitimate network traffic and web management requests, effectively cutting off network access for all connected devices. The attack surface is particularly concerning given that many enterprise and residential networks rely on such consumer-grade routers for basic connectivity, making this vulnerability a potential vector for widespread service disruption. The vulnerability aligns with ATT&CK technique T1499.004 for network denial of service attacks and represents a critical weakness in the device's input validation mechanisms.
Security mitigation strategies for this vulnerability should prioritize immediate firmware updates from Tenda's official support channels, as the vendor has likely released patches addressing the buffer overflow condition. Network administrators should implement network segmentation to isolate critical infrastructure from potentially compromised devices and establish monitoring protocols to detect unusual traffic patterns that may indicate exploitation attempts. Additional protective measures include disabling unnecessary web management interfaces when not actively required, implementing strict firewall rules to limit access to the router's web interface, and conducting regular vulnerability assessments to identify similar buffer overflow conditions in other network devices. The vulnerability demonstrates the importance of proper input validation and bounds checking in embedded systems, particularly those handling user-supplied data in web-facing components, and highlights the need for comprehensive security testing in network infrastructure devices.